package com.zero.rocketmq.api.base.producer.async;

import com.zero.rocketmq.api.utils.RocketMQContents;
import org.apache.rocketmq.client.exception.MQClientException;
import org.apache.rocketmq.client.producer.DefaultMQProducer;
import org.apache.rocketmq.client.producer.SendCallback;
import org.apache.rocketmq.client.producer.SendResult;
import org.apache.rocketmq.common.message.Message;
import org.apache.rocketmq.remoting.common.RemotingHelper;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

/**
 * 异步发送消息
 */
public class AsyncProducer {

    public static void main(String[] args) throws MQClientException {

        DefaultMQProducer producer = new DefaultMQProducer(RocketMQContents.PRODUCER_GROUP);
        producer.setNamesrvAddr(RocketMQContents.NAMESERVER_ADDR);
        producer.start();

        //在异步模式中声明发送失败之前内部重试的最大次数，他可能会导致消息重复，这取决于应用程序开发人员来解决。
        producer.setRetryTimesWhenSendAsyncFailed(0);

        int messageCount = 100;
        //由于是异步发送，这里引入一个countDownLatch，保证所有Producer发送消息的回调方法都执行完了再停止Producer服务。
        final CountDownLatch countDownLatch = new CountDownLatch(messageCount);

        try{
            for(int i = 0;i< messageCount;i++){
                final int index = i;
                Message msg = new Message("TopicTest",
                        "TagA",
                        "OrderID188",
                        "Hello world".getBytes(RemotingHelper.DEFAULT_CHARSET));

                producer.send(msg, new SendCallback() {
                    @Override
                    public void onSuccess(SendResult sendResult) {
                        countDownLatch.countDown();
                        System.out.printf("%-10d OK %s %n", index, sendResult.getMsgId());
                    }

                    @Override
                    public void onException(Throwable e) {
                        countDownLatch.countDown();
                        System.out.printf("%-10d Exception %s %n", index, e);
                        e.printStackTrace();
                    }
                });
            }
            System.out.println("消息发送完成");
            countDownLatch.await(5, TimeUnit.SECONDS);
            producer.shutdown();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
